The item is used for Korshawn's Silk Armor (Tier 1 Mage Hands, a.k.a. Runemaster's Gloves) which requires 1 Spire Control Shard and 2 Discordling Finger Bones. You can check the post on Korshawn's Silk Armor for list of items needed.

Location was the caves west of the Anguish Entrance in WoS, camped just before the big cave inside between the two named spots so you can camp both. Took about 4 hours to get a couple drop and some nice items.

I have been killing close to 350 Discordlings in WoS and aprox 150 in MPG and various other stuffs in both zones + NC and i havent seen 1 drop for over 1 month, i have 1 bone and the other item needed for trade in, but it just wont drop, been auctioning this in all zones i could think of, offering insane amounts of money for it.

I got the first bone in the end of november i think, after that i have not seen it =(